Add audio policy API changes for audio offload

Changes to the API of audio policy for audio offload support:
- Add isOffloadSupported() function
- Add OUTPUT_FLAG_OFFLOAD
- Extend AudioOutputDescriptor to include a sharing count for direct outputs
- Pass audio_offload_info_t when opening output streams

Change-Id: I5ad26418fdb286eb7ae299d586dd1fd525d48ab9
Signed-off-by: Richard Fitzgerald <rf@opensource.wolfsonmicro.com>
Signed-off-by: Eric Laurent <elaurent@google.com>
6 files changed